We have had it for about two years, one wheel broke at the point where the tire is held and now we need to get a new wheel. The company has not bothered to have sufficient stock of spare parts, resulting in the following options: either we put a different type of wheel, solid and not inflatable, and ultimately the wheelchair will have two different wheels, or we wait a month when they will probably have the correct spare part (not that it is certain). In short, poor quality at least in terms of the wheels - the rest seems to be sturdy - and terrible service for the spare parts.

It should also be noted that this wheelchair has a huge problem with inflating the wheels. Its rims have thick plastic spokes that leave minimal space for the valve, which ultimately is not accessible for you to inflate the wheel. They couldn't even inflate it at a gas station because the nozzle simply doesn't fit and can't reach the valve. The only solution I could find is using tubes with angled valves. But it's tragic to have to search for such specialized spare parts just to make a wheelchair functional. Overall, a disappointment in terms of construction and wheel quality. The only good thing is its weight, it's really lightweight.

p.s. The tubes that solved the inflation problem are these:
https://www.skroutz.gr/s/30478328/Schwalbe-%CE%A3%CE%B1%CE%BC%CF%80%CF%81%CE%AD%CE%BB%CE%B1-%CE%A0%CE%BF%CE%B4%CE%B7%CE%BB%CE%AC%CF%84%CE%BF%CF%85-12-12-1-2x2-1-4-%CE%BC%CE%B5-%CE%92%CE%B1%CE%BB%CE%B2%CE%AF%CE%B4%CE%B1-45.html
Alternatively, these could also work, I think:
https://www.skroutz.gr/s/24974392/Lorelli-1038003-%CE%A3%CE%B1%CE%BC%CF%80%CF%81%CE%AD%CE%BB%CE%B1-%CE%A0%CE%BF%CE%B4%CE%B7%CE%BB%CE%AC%CF%84%CE%BF%CF%85-12-%CE%B3%CE%B9%CE%B1-%CE%A4%CF%81%CE%AF%CE%BA%CF%85%CE%BA%CE%BB%CE%B1.html